Abusers often use other people to do their dirty work for them.
If all else fails, the abuser recruits friends, colleagues, mates, family members, the authorities, institutions, neighbours, the media, teachers â in short, third parties â to do his bidding. He uses them to cajole, coerce, threaten, stalk, offer, retreat, tempt, convince, harass, communicate and otherwise manipulate his target. He controls these unaware instruments exactly as he plans to control his ultimate prey. He employs the same mechanisms and devices. And he dumps his props unceremoniously when the job is done.
One form of control by proxy is to engineer situations in which abuse is inflicted upon another person. Such carefully crafted scenarios of embarrassment and humiliation provoke social sanctions (condemnation, opprobrium, or even physical punishment) against the victim. Society, or a social group become the instruments of the abuser.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)